Ryo Kikuchi

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Recently, several efforts to implement and use an unconditionally secure multi-party computation (MPC) scheme have been put into practice. These implementations are passively secure MPC schemes in which an adversary must follow the MPC schemes. Although passively secure MPC schemes are efficient, passive security has the strong restriction concerning the(More)
We provide a garbling scheme which creates garbled circuits of a very small constant size (four bits per gate) for circuits with fan-out one (formulas). For arbitrary fan-out, we additionally need only two ciphertexts per additional connection of each gate output wire. We make use of a trapdoor permutation for which we define a generalized notion of(More)
In this paper we propose the use of intra-body communication (IBC) for a personal health monitoring system employing inexpensive, lightweight, miniature sensor platforms. Body area networks (BANs) with physiological sensors will improve current healthcare services and at the same time significantly reduce costs to public health systems. We are primarily(More)
Issues related to ensuring patient privacy and data ownership in clinical repositories prevent the growth of translational research. Previous studies have used an aggregator agent to obscure clinical repositories from the data user, and to ensure the privacy of output using statistical disclosure control. However, there remain several issues that must be(More)